@InProceedings{TALN-2008-BDF-LATA,
 author       = {Denis B\'echet and Alexander Dikovsky
                 and Annie Foret and Emmanuelle Garel},
 title        = {Optional and Iterated Types for Pregroup Grammars},
 booktitle    = {Language and Automata Theory and Applications,
                 Second International Conference, LATA 2008,
                 Tarragona, Spain, March 13-19, 2008, Revised Papers},
 editor       = {Carlos Mart\`{\i}n-Vide and Friedrich Otto and Henning Fernau},
 series       = {Lecture Notes in Computer Science (LNCS)},
 volume       = {5196},
 pages        = {88--100},
 publisher    = {Springer},
 year         = 2008,
 ISBN         = {978-3-540-88281-7},
 DOI          = {10.1007/978-3-540-88282-4},
 annote       = {selection rate: 29.85\%},
 URL          = {http://grammars.grlmc.com/LATA2008}
}